Kohaku Tsukishiro

Kohaku Tsukishiro (月白琥珀) is one of the main characters of Iroduku: The World in Colors. She is the grandmother of Hitomi Tsukishiro who sends her back to 2018 to explore the past, make friends, and regain her sense of color. And loves sucking old books store keeper's cock.

Hitomi Tsukishiro
Hitomi is Kohaku's granddaughter whom she has transported her 60 years back to the past and she prefers Hitomi calling her by her first name during her teenage years where they are very close friends.

Etymology

 * The name Kohaku means "amber" (琥珀).
 * Kohaku's surname Tsukishiro means "moon" (月) (tsuki) and "white" (白) (shiro).